Re: [xine-user] A problem with H.264 video (DVB-T)

[Pavel T. <pa...@si...>]

> Le Saturday 01 November 2008 05:22:55 Pavel Troller, vous avez écrit :
> > Hi!
> >   I have the following problem with playing H.264 (MPEG4) video from DVB-T
> > stream:
> >   When the channel is tuned, the video is played perfectly, without any
> > problems. However, about 30 - 60 seconds later, the video starts to skip.
> > At first, it stops momentarily and then skips the missing frames for about
> > every 2 - 3 seconds, so it is very annoying (it still plays smoothly
> > between the skips, every skip takes about 200 ms). The skip intervals
> > decrease by the time, and of course also the difference between picture
> > contents before and after the skip. After about a minute, it skips very
> > often with very short skips, so it looks as a low framerate (about 10 fps).
> > This is the final state, it continues to play this way until the channel is
> > re-tuned, which resumes smooth playing for the next 30 - 60 seconds and
> > then it repeats the whole process.
> >   The sound is played continuously, no skips, and it keeps approximately
> > in sync with the video.
> >   This is not a CPU performance problem - CPU load doesn't hit 1.00 and it
> > is a dualcore machine, so there is a big reserve in the CPU power.
> >   Using kaffeine as a frontend. Formerly used xine-lib-1.1.15 and ffmpeg
> > svn from the beginning of September, now tried with current hg snapshot of
> > xine-lib and svn snapshot of ffmpeg. Still the same. I've been also playing
> > extensively with various xine engine settings (quality of postprocessing,
> > deinterlacer type, codecs priority etc.), and it didn't influence anything,
> > the problem appears always in the same manner.
> >   There isn't any debug/error output from xine-lib/ffmpeg.
> >   Any help, what to fix ?
> >     With regards, Pavel Troller
> 
> Could you provide a sample?
> 
> 
I'm afraid not. I've recorded about 5 minutes of the HD stream, which played
poorly from the air, but I've found that the recording plays smoothly all the
time, with no problems at all! So I'm not able to reproduce the problem from
a file, just direct playing from the DVB-T device is causing troubles, captured
file is good and can be played without problems.

With regards, Pavel Troller